Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 3_1_3 like Mac OS X; en-us) AppleWebKit/528.18 (KHTML, like Gecko) Version/4.0 Mobile/7E18 Safari/528.16) My iPhone 3G (I know, I know - I should upgrade...) is currently running iOS 3.1.3. My 7-year old daughter is dying for me to get Angry Birds, but it only runs on 4.0 or higher. I'm aware that 4.0 killed most 3G phones, but that Apple also updated 4.0 to address this issue. Should I upgrade? Will I notice a difference in speed? It's kinda slow already, but I'm obviously used to it... Thanks for any advice.